A pair of physicists toss a coin n times each.
What is the probability that they tossed the same number of heads?
Input: N % number of tosses
Output: P
Examples:
N=1 P=0.5;
N=2 P=0.375
Test Suite will round to 6 places
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Solution 184390
This fails for test case 4 even though it is mathematically correct--it gives 0.27343749999999994 instead of 0.2734375, while the test suite asks for 0.273438; it seems as though a fair test generally has to be of the form abs(y-y_correct)